Helium atom diffraction measurements of the surface structure and vibrational dynamics of CH_3-Si(111) and CD_3-Si(111) surfaces

The surface structure and vibrational dynamics of CH_3–Si(111) and CD_3–Si(111) surfaces were measured using helium atom scattering. The elastic diffraction patterns exhibited a lattice constant of 3.82 Å, in accordance with the spacing of the silicon underlayer. The excellent quality of the observed diffraction patterns, along with minimal diffuse background, indicated a high degree of long-range ordering and a low defect density for this interface. The vibrational dynamics were investigated by measurement of the Debye–Waller attenuation of the elastic diffraction peaks as the surface temperature was increased. The angular dependence of the specular (θ_i=θ_f) decay revealed perpendicular mean-square displacements of 1.0 x 10^(−5) Å^2 K^(−1) for the CH_3–Si(111) surface and 1.2 x 10^(−5) Å^2 K^(−1) for the CD_3–Si(111) surface, and a He-surface attractive well depth of ~7 meV. The effective surface Debye temperatures were calculated to be 983 K for the CH_3–Si(111) surface and 824 K for the CD_3–Si(111) surface. These relatively large Debye temperatures suggest that collisional energy accommodation at the surface occurs primarily through the Si–C local molecular modes. The parallel mean-square displacements were 7.1 x 10^(−4) and 7.2 x 10^(−4) Å^2 K^(−1) for the CH_3–Si(111) and CD_3–Si(111) surfaces, respectively. The observed increase in thermal motion is consistent with the interaction between the helium atoms and Si–CH_3 bending modes. These experiments have thus yielded detailed information on the dynamical properties of these robust and technologically interesting semiconductor interfaces

The Supreme Constitutional Court of Egypt on Islamic Law, Veiling and Civil Rights: An Annotated Translation of Supreme Constitutional Court of Egypt Case No. 8 of Judicial Year 17

The jurisprudence of the Supreme Constitutional Court of Egypt is creative and influential in the Arab world. Among its opinions, Case No. 8 of Judicial Year 17, decided on May 18, 1996, is particularly interesting. In this opinion, the SCC argues that a regulation on face-veiling in public schools is consistent not only with Islamic law, but with the Egyptian Constitution\u27s guarantees of freedom of religion and freedom of expression. Not only does it illustrate the SCC\u27s approach to Islamic legal reasoning, but it gives insight into the Court\u27s views with respect to civil and political rights. The case also provides intriguing opportunities for comparative legal scholars. Regulations restricting women\u27s right to veil have been challenged as unconstitutional in many countries. This should thus be of great interest to scholars of comparative law, comparative constitutionalism and international human rights. We provide here an annotated translation of this SCC opinion. We thus hope to facilitate comparative discussion about, inter alia, free exercise of religion, freedom of expression, women\u27s rights, and children\u27s rights

Do Constitutions Requiring Adherence to Shari`a Threaten Human Rights? How Egypt’s Constitutional Court Reconciles Islamic Law with the Liberal Rule of Law

Over the last thirty years, a number of Muslim countries, including most recently Afghanistan and Iraq, have adopted constitutions that require the law of the state to respect fundamental Islamic legal norms. What happens when countries with a secular legal system adopt these constitutional Islamization provisions? How do courts interpret them? This article will present a case study of constitutional Islamization in one important and influential country, Egypt. In interpreting Egypt\u27s constitutional Islamization provision, the Supreme Constitutional Court of Egypt has interpreted Shari\u27a norms to be consistent with international human rights norms and with liberal economic policies. The experience of Egypt does not tell us how constitutional Islamization will necessarily unfold in every country. It does demonstrate that, in a world where Islamic norms are contested, a progressive court can effectively develop and apply a theory that interprets Islamic legal norms to be consistent with democracy, international human rights and economic liberalism

Constitutionalism, religion, and education

This article compares the constitutional protection of religious education in Egypt, Ireland, and Norway. It shows that such protection has, in each case, path-dependent qualities that suggest religious education is relatively immune to constitutional attack. This immunity has been marked both at the point of independence and in the more secularizing periods that followed. It cannot be explained by different historical trajectories or by differences in confessional culture. Although the stakes are high in this area (for states, religious bodies, and parents), contrary to what separationist understandings of the modern state would expect, each state has maintained an openly accommodationist relationship with religious bodies in this field more than any other. The conclusion explores some reasons for why these accommodationist practices, which span three centuries, have continued

Constitutional Reform in the Arab Spring: A New Beginning or an Unhappy Ending?

Some years ago, when I was considering various paths my scholarly agenda could take, I asked a colleague of mine who worked on international law regarding Antarctica how he had selected his specialization. He responded that the obscurity of the subject was its own reward: even if he produced bad scholarship, he would still be one of the top people in his field. It was in this spirit that I decided to focus on constitu­tionalism in the Arab world. What little attention the topic had attracted was negative. For centuries, Middle Eastern political systems have been held up by Western students of constitutionalism to be negative models: helping us understand who we are by showing us what we are not

Microwave Power Transmission System Studies. Volume 1: Executive Summary

A study of microwave power generation, transmission, reception and control was conducted as a part of a program to demonstrate the feasibility of power transmission from geosynchronous orbit. A summary is presented of results concerning design approaches, estimated costs (ROM), critical technology, associated ground and orbital test programs with emphasis on dc to rf conversion, transmitting antenna, phase control, mechanical systems, flight operations, ground power receiving-rectifying antenna with systems analysis, and evaluation. Recommendations for early further in-depth studies complementing the technology program are included

Microwave power transmission system studies. Volume 2: Introduction, organization, environmental and spaceborne systems analyses

Introduction, organization, analyses, conclusions, and recommendations for each of the spaceborne subsystems are presented. Environmental effects - propagation analyses are presented with appendices covering radio wave diffraction by random ionospheric irregularities, self-focusing plasma instabilities and ohmic heating of the D-region. Analyses of dc to rf conversion subsystems and system considerations for both the amplitron and the klystron are included with appendices for the klystron covering cavity circuit calculations, output power of the solenoid-focused klystron, thermal control system, and confined flow focusing of a relativistic beam. The photovoltaic power source characteristics are discussed as they apply to interfacing with the power distribution flow paths, magnetic field interaction, dc to rf converter protection, power distribution including estimates for the power budget, weights, and costs. Analyses for the transmitting antenna consider the aperture illumination and size, with associated efficiencies and ground power distributions. Analyses of subarray types and dimensions, attitude error, flatness, phase error, subarray layout, frequency tolerance, attenuation, waveguide dimensional tolerances, mechanical including thermal considerations are included. Implications associated with transportation, assembly and packaging, attitude control and alignment are discussed. The phase front control subsystem, including both ground based pilot signal driven adaptive and ground command approaches with their associated phase errors, are analyzed